Song conquest of Southern Tang

[10] Normally, any attacker would be destroyed; however, the wind blew in the opposite direction of the flamethrowers so the burning oil flew back onto the Tang.

[13] About 150,000 Tang soldiers and sailors were killed in the fire and Zhu Lingyun committed suicide by jumping into the flames.

[14] Considering the position of Nanking in China, where the imperial capital would have been, and the above "evidence", it can be assumed that there was a strong westerly wind on the day of that battle.

On a technological note, we know that the Wujing Zongyao, written in 1044 (although the oldest edition is from around the 1560s), describes the flamethrowers oil being lit by fire drug (a flammable, quasi explosive compound that would in later cultures and generations be refined into gunpowder) and we know that fire drug was invented as a medicine sometime in the 9th century, but whether this battle did use gunpowder is speculative.

After the fall of Tang, Lu Jiang acting Military Governor of Zhaowu Circuit continued to resist Song army after seizing She Prefecture before persuaded to surrender; General Hu Ze at Jiang Prefecture also continued the resistance for four months more.